But not game enough to wear a bikini. "My kids would be so embarrassed!" she says. "In private I may wear a bikini, but at the public beach with my kids I would change bathing suits because they do not want to be hanging out with some old broad in a bikini."

Others disagree. "She looks phenomenal," says MJ Day, senior editor for Sports Illustrated's swimsuit issue (Sports Illustrated is a sister publication of PEOPLE). "She has the legs of a 30-year-old and the face of an angel. She's what you aspire to look like at 60. She's mind-blowingly beautiful."

In this week's issue, Brinkley spells out all of her stay-young secrets, from her daily diet to all the beauty tricks to looking half her age.

But after four divorces, including an explosive public divorce trial with architect Peter Cook in 2008, Brinkley credits her three kids – musician Alexa Ray Joel, 28, college freshman Jack Brinkley-Cook, 18, and up-and-coming model Sailor Brinkley-Cook, 15 – as her fountain of youth and her motivation to focus on a healthy lifestyle.